Dilation Characteristics of FRP-Confined Square Engineered Cementitious Composite Columns
Publication: Journal of Composites for Construction
Volume 27, Issue 2
Abstract
As emerging high-performance concrete, the engineered cementitious composite (ECC) has demonstrated excellent application potential in civil engineering. With the wide application of ECC, it not only excels in the tension state and the structural elements but also in the more complex stress state of nonuniform confinement. For a reliable and economic ECC element design, understanding the dilation behavior of ECC is crucial under complicated stress conditions. This paper presents an experimental investigation and a detailed discussion of the ECC dilation characteristics under different confinement rigidities. The authors evaluate the effects of column parameters, such as different types of fiber-reinforced polymer (FRP) composites, confinement levels, and cross-sectional shapes. Test results indicate that the ECC dilation amplitude (secant dilation) under FRP confinement is less than that of concrete due to fiber bridge effects within ECC. However, the maximum dilation rate (tangent dilation ratio) shows an opposite trend. Based on the data analysis in this study, a new lateral strain-to-axial strain model was proposed, which can predict the dilation behavior of FRP-confined ECC with nonuniform confining pressure. The proposed model not only accurately captures the dilation process of FRP-confined ECC but also precisely predicts its ultimate strain. In addition, the existing peak strength and ultimate strength models were also evaluated by the ECC test results. The comparison indicates that the strength models for concrete also apply to FRP-confined ECC when the ultimate hoop-confining stress is accurately determined.
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Acknowledgments
The authors gratefully acknowledge the financial support by the National Key Research and Development Project of China (Grant No. 2018YFE0125000), the National Natural Science Foundation of China (Grant No. 52078299), the Guangdong Basic and Applied Basic Research Fund Project (Grant No. 2020A1515011552), and the Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering (SZU) (Grant No. 2020B1212060074). Funding from the Shenzhen Science and Technology Program (Grant Nos. KQTD20200820113004005 and 20200807104705001) is also acknowledged, for which the authors are grateful.
Notation
The following symbols are used in this paper:
- b
- section width or diameter of the column (mm);
- D
- diameter;
- Ec
- elastic modulus of the unconfined specimen (MPa);
- Ef
- modulus of elasticity of FRP (MPa);
- Ef1
- initial elastic modulus of elasticity of PET (MPa);
- Ef2
- second-stage elastic modulus of elasticity of PET (MPa);
- E1
- elastic modulus of the FRP-confined specimen (MPa);
- E2
- second slop of the FRP-confined specimen (MPa);
- E3
- third slop of the FRP-confined specimen (MPa);
- fcc
- initial peak stress (MPa);
- fco
- compressive strength of the unconfined specimen (MPa);
- fcu
- ultimate stress (MPa);
- fc1
- stress in the inflection point (MPa);
- fl
- FRP confining pressure (MPa);
- h
- lengths of the longer sides of the rectangular column (mm);
- kɛ
- effective FRP rupture strain ratio;
- r
- corner radius (mm);
- tf
- thickness of FRP (mm);
- ɛc
- axial strain;
- ɛcc
- initial peak strain;
- ɛco
- strain corresponding to the compressive strength of the unconfined specimen;
- ɛcu
- ultimate strain;
- ɛc1
- strain in the inflection point;
- ɛfrp
- FRP rupture strain of coupon tests;
- ɛh,rup
- FRP rupture strain;
- ɛl
- lateral strain;
- μs
- secant dilation ratio;
- μ1
- slope of the lateral strain-to-axial strain curve for FRP-confined ECC after the turning point;
- μ2
- slope of the lateral strain-to-axial strain curve for FRP-confined concrete after the turning point; and
- μt
- tangent dilation ratio.
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Published In
Journal of Composites for Construction
Volume 27 • Issue 2 • April 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Feb 9, 2022
Accepted: Oct 25, 2022
Published online: Dec 26, 2022
Published in print: Apr 1, 2023
Discussion open until: May 26, 2023
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